(1) Comparison between the tip size of an acrylic-tipped stylus (left) and a rubber-tipped stylus (right), (2) Internal structure of a rubber-tipped stylus (left) and an acrylic-tipped stylus (center) and a different posture of holding a rubber-tipped stylus (right) (3) A 0.1-mm-thick silicon film and a 0.5-mm-thick urethane film-attached smartphone, and (4) A commercial android app “Yellow 25”. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
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